50 patients with hair loss are given a new drug, and 40 other patients are just given a placebo. 35 of the patients who got the drug report improvement of their condition. 25 of the patients
who got the placebo report improvement. This sort of thing is better represented in a table.
What is the probability that a random patient from this group reported improvement, given
that they got the placebo? (You do not need all of the information here - often the case in a
realistic situation).
Number of patients given drug/placebo who report improvement/no improvement
Treatment Drug Placebo
Improvement 35 25
No Improv. 15 15
Total 50 40
a. 62.5%
b.25%
C. 35%
d. 50%